Embossing machine drive



Nov. 21, 1950 H. EBERHARDT EMBOSSING MACHINE DRIVE 4 Sheets-Sheet 1Filed April 4, 1949 INVEN TOR. HEEMflA/ EB EEHHEDT BY W Nov. 21,1950 H.EBERHARDT 2,530,425

EMBOSSING MACHINE DRIVE Filed April 4, 1949 '4 Sheets-Sheet 2 W VMATTORNEY Nov. 21, 1950 H. EBERHARDT 2,530,425

EMBOSSING MACHINE DRIVE g 2 INVENTOR. Haw/4N f5 EPHFYEDT BY ,4 TTOP/VEYNov. 21, 1950 EBERHARDT EMBOSSING MACHINE DRIVE 4 Sheets-Sheet 4 FiledApril 4, 1949 Ill INVEN TOR. HEP/144M 65521141907 m wm 147' TOP/V5 YPatented Nov. 21, 1950 UNITED STATES PATENT OFFICE EMBOSSING MACHINEDRIVE Herman Eberhardt, Fairlawn, N. 3., assignor to Van VlaanderenMachine Company, Paterson, N. J., a corporation of New JerseyApplication April 4, 1949, Serial No. 85,452

11 Claims. 1

This invention relates to a synchronizing drive for a machine whereintwo rotatively driven parts, adjustable toward each other, must bemaintained in very accurate angular synchro- More particularly, theinvention relates to a drive of the above indicated character for therolls of an embossing machine for paper, cloth, and the like.

In machines for embossing paper, cloth, and the like, of the type inwhich the drive of the present invention is particularly useful, thereis employed a hardened steel roll provided on its periphery with thedesired pattern in relief, such steel roll lying above and parallel to abottom roll, the bottom roll being constantly strongly urged intocontact with the upper roll. Such bottom roll is conventionally formedby pressing together a large number of paper discs, the paper roll beingquite hard but yet sufiiciently soft so that the upper, steel rollimpresses therein a pattern corresponding to the pattern on such upperroll. Continued rotation on the two rolls with an interposed layer ofthin material such as paper and cloth during the embossing operationresults in wear of an appreciable amount on the paper roll, use of suchroll being continued until the roll reaches a predetermined minimumdiameter, after which it is discarded.

In embossing machines of the described type it has been attempted tomaintain the two rolls in synchronism by means of meshing gears one ofwhich is mounted fixedly on the neck of one roll and the other of whichis mounted fixedly on the corresponding neck of the other. It will beappreciated, however, that, as the bottom roll wears in such machine,the meshing engagement of the two gears changes progressively. Thus,although'the two gearscontinue to maintain approximately angularsynchronism between the two rolls, such change of meshing engagement ofthe gears introduces numerous variations in the peripheral engagement ofthe two rolls. In addition, the change in diameter of the lower roll issometimes so great that one or both gears has to be ground down on their.peripheries in order that the points of their teeth do not engage theroots of the teeth of the other gear.

Thus the described prior synchronizing gears of embossing machines ofthis type have been faulty because of the progressive change of the meshof the gears and, as a result, accelerated wear of such gears results.Furthermore, maintenance costs are high due to the necessity of alteringthe gears as the paper roll wears. Such continual variation in the meshbetween the gears results in momentary angular accelerations anddecelerations of one roll with respect to the other, thereby causingfaulty peripheral synchronism of the rolls, the machine, as a result,yielding a goods treated thereby which have a non-uniform pattern." Suchnon-uniformity of peripheral synchronism further accelerates the wearingdown of the paper roll.

In the embossing machine drive of the present invention the gearsmaintaining synchronism between the. rolls of the machine are so mountedas to retain a constant meshing relationship regardless of the change indiameter of one or more of the rolls. Broadly, the drive of theinvention provides a. flexible driving means between the rolls, thepreferred primary driving means maintaining. synchronism between the tworolls being gears which are fixedly mounted with respect to each otherduring operation of the machine, so that the manner of mesh of the gearsremains constant. As a result such primary driving gears remainunaltered during the wearing down of any particular paper roll, and maybe continued to be used when .a new, larger, diameter paper roll issubstituted for the old paper roll. Such gears need, therefore, seldomto be replaced and an embossing machine embodying such drive requiresmuch less maintenance. Also, a more uniformly embossed product resultsfrom use of the machine, and the paper roll in the machine, because ofthe markedly increased accuracy of peripheral synchronism, is worn downat a much slower rate than formerly.

It is, accordingly, an object of the invention to provide an improveddrive for elements such as the cooperating rolls of an embossing machinewherein the maintenance of the synchronizing gears is minimized, a moreuniform synchronized drive is produced, and a more perfect, moreuniform, product is obtained.

The invention has as a further object the provision of acompact,efiicient, easily constructed and maintained drive for machinesoftheabove typ These and further objects of the invention will be morereadily apparent in the following descrip-tion of. preferred embodimentsthereof shown in the accompanying drawings, in which Fig. 1 is a view inperspective from the front of an embossing machine of the described typeembodying the synchronizing drive of the invention;

Fig. 2 is a view of the'machine in side elevation, the view being takenin a direction from right to left in Fig. .l;

Fig. 3 is a view partially in elevation and partially in longitudinalvertical section through the machine of the invention, portions of themachine in the longitudinal center being omitted;

Fig. 4 is an enlarged view partially in elevation and partially invertical section through the flexible synchronizing driving meansbetween rolls of the machine; and

Fig. 5 is a view in front elevation of a portion of an alternativeconstruction of the synchronizing driving means of the invention.

As above mentioned, Figs. 1, 2, 3, and 4 show a first embodiment of thesynchronizing drive of the invention, and Fig. 5 shows a secondembodiment thereof. In Fig. l the embossing machine is shown comprisingtwo spaced vertically extending side frame members 2 and 4, such sideframe members being connected together by means of the bottom cross-rods6 and the top cross-rod 8. Each side frame member is provided with avertically extending guideway, that on member 2 being shown at I6, andthat on frame member 4 being designated I2. Supported between the sideframe members in vertically aligned parallel relationship are the topsteel embossing roll I4 and the bottom paper embossing roll I6. Roll I4is mounted for rotation by means of the bearing chocks I8 and 20slidingly mounted and retained on guideways I and I2, respectively. Roll56 is rotatably mounted in the bearin chocks 22 and 24 which areslidably mounted and retained upon guideways H] and I2, respectively.Cooperating with the seat 30 on chock I8 is a vertical screw 26 which isthreadedly engaged in an overhanging portion of frame member 2. Asimilar screw 28 is provided in frame member 4 for cooperation with seat32 on chock 20.

Screws 26 and 28 are initially adjusted, upon installation of a new rollIE, to bring the roll Hi into the desired horizontal alignment. Duringregular operation of the embossing machine, screws 26 and 28 are notnormally adjusted. Roll i6 is thrust upwardly into contact with roll I4by means of the plunge-rs 34 and 36 which engage abutments 36 and 46 onchock members 22 and 24, respectively. Plungers 34 and 38 are urgedupwardly with the desired predetermined force by means of conventionalweighted lever systems, the removable weights acting upon plunger 35through levers (not shown) being shown at 4-2 and those acting uponplunger 36 through similar levers being shown at 44.

As shown in Figs. 2 and 3 the embossing machine is driven by means ofthe electric motor 46 which drives through belt 48 into the adjustablespeed changing mechanism 56. The drive proceeds from speed change box59, from delivery sprocket thereon through the chain 52 to the sprocket55 aflixed to the right-hand end of countershaft '54, as shown in Fig.3. Countershait 54 runs horizontally along the back of the machine andcarries upon its left-hand end, as shown in Fig. 1, a sprocket 56. Fromsprocket 65 there runs a. chain 58 which is entrained over sprocket 66on the left-hand roll neck of roll I4.

The synchronizing driving mechanism between the two rolls I4 and I6 isshown at the right in Fig. 3. As there shown, apinion gear 62 is fixedlykeyed upon the right-hand end of the roll neck 64 of roll I l. Avertically disposed side plate 66 is mounted upon the outer side offrame memher t, being spaced therefrom by spacer sleeves of which one isshown at 68 and being retained thereon by means of the lower front studl6 and the two rear studs 12 and I4. as shown in Fig. 2,

4- Secured to plate 66 is the horizontal laterally extending supportmember I6. Member 26 carries at its outer end a vertically extendingsupport I8 which has a bearing 88 disposed in its upper end.

Plate 66 has a circular opening 83 therein which is generally coaxialwith the roll neck 82 of the roll I6, as shown more clearly in Fig. 4.Opening 83, which is of a diameter substantially exceeding the outer endI30 of the roll neck 82, has a counterbore 86 which receives the outeredge of the flange portion of the outwardly projecting sleeve member 84.Member 84 is fixedly retained in position on plate 66 by means of thestuds 88. A ring gear 98 having within it the bearing bushing 92 isrotatably supported on the outer cylindrical surface of sleeve 84, asshown. Gear at is permanently in mesh with gear 62 on the neck of rollHi, the axes of such two gears remaining fixed with relation to eachother during regular operation of the embossing machine.

AfiiXed to the outer surface of gear is the elongated hollow shaft orhousing 94. One of the angularly spaced studs securing parts 90 and 93together is shown at 96. A stepped stub shaft 98 supports the outer endof member 94 upon the standard '18. As shown, the smaller portion of thestub shaft is rotatably supported in bearing 88, the larger portion ofsuch a stub shaft being keyed in the end boss I00 in housing 94.

stub shaft 98 terminates inwardly with the flange I62, which ispositioned within the outer end portion of housing 94. Flange I62constitutes an end portion of a flexible coupling which i is generallydesignated I63. The coupling shown is of the type known as the Dykmansphere gear coupling which allows a misalignment between the couplingparts of as much as 2 while maintaining zero backlash between suchparts. A

"- coupling of the type described is also designated the Barcus aligningshaft coupling, such coupling being made by the Barcus EngineeringCompany, Baltimore, Maryland The outer portion of coupling I03 iscompleted by the cylindrical housing I64 which is secured to flange I62by means of angularly spaced studs I66. Member I34 carries within it thestraight, angularly spaced, radially directed gear teeth I08 Withinwhich fit the rounded, angularly spaced, outwardly directed gear teethII2 on the inner coupling part H0. Part H6 is provided with a centralbore I It within which is keyed the outer end of the shaft II6. ShaftII6, which is disposed coaxially with the housing 94 and with gear 36,is connected at its inner end to another flexible coupling I I8 which issimilar to coupling H3. The inner end of shaft I I6 is keyed within thebore I22 in the inner coupling part I20. Part 126 carries on aprojecting flange the outwardly directed rounded gear teeth 124 whichfit within the inwardly directed straight gear teeth I26 on the outercoupling part I28. Part I28 of coupling H8 is keyed, as shown, to theouter projecting end I36 of the roll neck '82 of roll I6.

The manner of operation of the synchronizing drive above described willbe clearly apparent. In such first embodiment, the drive proceeds fromthe motor 46 to the left-hand end of roll I4. Roll Id, in turn, drivesgear 62 which is permanently in mesh with gear 96, gear 96 rotating on afixed axis. Roll It is, of course, mounted for vertical movement, inresponse to thrust by the lever system, which is independent of the gear90. Thus the mesh of the two gears 52 and 98 remains constant duringoperation of the maeases EL Li chine regardless f the ancestor wearincorrect by and the vertical waver er the roll la.- The drive proceedsem gear' 7 so throngs hdll'ow shah housing 94 back through the flexibledrive system composed of the flexible coupling I03, thej sh'aft H6,andthe second flexible (Sou-- pling H8, tothe neck of the roll IE.-

I Because-er the accurate and fixed meshing re" lationship between thegears 62 and 9D, and eecause of the type of flexible coupling piereraeiempipyed, n which the backlash is at least sub"- stantially zero; thedrive maintainsat all times aii ang'ular ynehremsm between rolls H a e Isuchs'yfiehrenism be g maintainedcom-ever: an and alsoinclielhenta-l'ly; that is at any-given instant. addition to siichenema-r syriehio nism, the drive of the invent n maintainssubstantialperip eral synchronise between the ions, excepting, of coarse, theeirect in'tfodue d because of the constants diminishing diameter of rollI6. The drive of the invention, however; intro'duces no additionalvariable factors to such} c nstantl diminishing diameter ofroll' Hi; andthusvariation in peripheral synchroni'sm between the tworolls-occursonly gradually. Thus the product treated by an embossingmachine embodying the drive of the invention is distin' gui'shed by itssubstantial and continueduniformity';

In the alternative embodiment of the synchronizing driveof theinvention, shown in Fig. 5, the main parts thereofare the same as thoseshown in Figures 1 to 4, inclusive. and are thus similarly designated.In the construction shown in Fig. 5' the drive from" the prime moverthrough the change speed mechanism is effected directly from the hollowshaft or housing 94. Conse qu'e'ntly, countersliaft 54 and the sprocketsthere"- on; as well as the sprocket 60 at the left-hand end of roll M,as shown in Fig. 3, are omitted. In their stead there is provided asprocket I32 which embraces and is keyed to the housing 94. The drivingchain from the output end of the change speed mechanism 50, designatedI34 in Fig. 5, is entrained directly over the delivery sprocket 5| ofmeans 50' and over the sprocket I32 on housing 94. The constructionshown in 5 is of advantage because of its simplicity, and thus becauseof the added ease of its main tenance. In addition it eliminates thenecessity for several parts and, consequently, reduces the cost of thesynchronizing drive.

Whereasfor purposes of illustration Lhave shown and described twopreferred embodiments of the drive for embossing machines of myinvention, it is to be understood that such em-; bodiments areillustrative only and that the invention is capable of considerablevariations as to its details of construction and also as to its mannerof application. The invention is, therefore, to be defined by the scopeof the claims appended hereto.

I claim as new the following:

1. In a machine including two rotary driven members mounted on axes.parallel and adjacent to each other, means for mounting the firstmember with its axis is fixed position during operation of the machine,means for mounting the second one of the members so that its axis maymove toward the axis of the first member, the improved means to drivesuch two rotary members inopposite directions in synchronism with. eachother comprising a first gear fixedly connected to and rotatable withthe first one of an new driven e on 'meurited on a listed was generallyccaxiai wit 6% the second drivefimefiibei" arid permanently meshing withthe first gear, a first, hollow, shaftconn cted to and rotatable withthe second gear, said hollow shaftlying generally coaxial with thesecond rotary dr ven member and extending away from said secondrotarydriven member to a point substantially removed from the sec-- 0nd gearand fui the'? removedfrom said second rotary driven member, a secondshaft lying with in the hollow shaft andconnected thereto sub'--stafitially atsaid point: spaced from the second gear and to the secondrotary driven member and rotatable withthe hollow shaft,- the' train consisting of the hollow shaft and the second shaft rotating at thes'amespeed as the second gear; said train incorporating serially thereofa sex: ible driving connection, and means for rotatably driving theconnected system consisting of the two rotary driven members. the firstand sec- 0nd gears, and the first and second shafts.

2. In an embossing machine including two rolls mounted on axes parallelto' each other, means for mounting the first roll with its axis in fixedposition during operation of the machine,

means for mounting the second roll so that its said first driving meansextending awayfrom said second roll to a point substantially removedfrom the second gear and further removed from said second roll, a seconddriving means connected to the first driving means substantially at saidpoint spaced from the second gear and to the second roll and rotatablewith thefirst driv ing means,,the train consisting of the firstandsecond driving means rotating at the same speed as the second gear, saidtrain incorporating serially thereof a flexible driving connection, and

. means for rotatably driving the connected sys* tem consisting of thetwo rolls,- the first and second gears, and the first and seconddrivingmeans. v I

3. In an embossing machine including two rolls mounted on axes parallelto each other; means formounting the first roll with its axis in fixedpositioh during operation of the machine, means for mounting the secondroll so that its axis may move toward the axis of the first roll, theimproved means to drive such two rolls in opposite directions insynchronism with each other comprising afirst gea fixedly connected toand rotatable with the first roll, a second gear mounted on a fixed axisand permanently meshing with the first, gear, a first driving meansconnected to and rotatable with the second gear, said first drivingmeans extending away from said second roll generally parallel to theaxis" of the second roll to a point substantially removed from thesecond gear and further removed from said second roll, a second drivingmeans connected to the first driving means substantially at said pointspaced from the second gear and to the second roll and rotatable withthe first driving means, the train consisting of the firstand seconddriving means rotating at the same speed as the second gear, said trainincorporating serially thereof a nexibie driving coiii'leetiofi, andmeans for rotatab-ly driving the connected s'y'stfii mesmeof the aresets,- the first ee tee 7 ond gears, and the first and second drivingmeans. I

4. In an embossing machine including two rolls mounted on axes parallelto each other, means for mounting the first roll with its axis in fixedposition during operation of the machine, means for mounting the secondroll so that its axis may move toward the axis of the first roll, theimproved means to drive such two rolls in opposite directions insynchronism with each other comprising a first gear fixedly connected toand rotatable with the first roll, a second gear mounted on a fixed axisgenerally coaxial with the second roll and permanently meshing with thefirst gear, a first, hollow, shaft connected to and rotatable with thesecond gear, said hollow shaft lying generally coaxial with the secondroll and extending away from said second roll to a point substantiallyremoved from the second gear and further removed from said second roll,a second shaft lying within the hollow shaft and connected theretosubstantially at said point spaced from the second gear and to thesecond roll and rotatable with the hollow shaft, the train consisting ofthe hollow shaft and the second shaft rotating at the same speed as thesecond gear, said train incorporating serially thereof, a flexibledriving connection, and means for rotatably driving the connected systemconsisting of the two rolls, the first and second gears, and the firstand second shafts.

5. In an embossing machine including two rolls mounted on axes parallelto each other, a frame for mounting the first roll with its axis infixed position during operation of the machine, means for mounting thesecond roll in such frame so that its axis may move toward the axis ofthe first roll, the improved means to drive such two rolls in oppositedirections in synchronism with each other comprising a first gearfixedly connected to and rotatable with the neck of the first roll, asecond gear permanently meshing with the first gear, means on the framefor mounting the second gear on a fixed axis generally coaxial with thesecond roll, an elongated housing member connected to the second gearcoaxially therewith, said housing member extending away from said secondroll generally parallel to the second roll from the gear to an outer endspaced substantially from the second gear and further removed from saidsecond roll, a driving means lying within the housing and extendingsubstantially from and connecting the outer end thereof to the neck ofthe second roll adjacent the second gear, the

train consisting of the housing and the driving means rotating at thesame speed as the second gear, said train incorporating serially thereofa flexible driving connection, and means for rotatably driving theconnected system consisting of the two rolls, the first and secondgears, the housing, and the driving means connecting the housing to thesecond roll.

6. In an embossing machine including two rolls mounted on axes parallelto each other, a frame for mounting the first roll with its axis infixed position during operation of the machine, means for mounting thesecond roll in such frame so that its axis may move toward the axis ofthe first roll, the improved means to drive such two rolls in oppositedirections in synchronism with each other comprising a first gearfixedly connected to and rotatable with the neck of the first roll at aposition outside the frame, a second gear permanently meshing with thefirst gear, means on the frame for mounting the second gear outside theframe on a fixed axis generally coaxial with the second roll, the secondroll having a. neck extending freely through the second gear, anelongated housing member connected to the outer face of the second gearcoaxially therewith and extending away from said second roll to a pointsubstantially removed from said second gear and further removed fromsaid second roll, a driving shaft lying within the housing and extendingsubstantially from and connecting the outer end thereof to thaforementioned neck of the second roll, said driving shaft including aflexible coupling connected serially thereof, and means for rotatablydriving the connected system consisting of the two rolls, the first andsecond gears, the housing and the driving shaft.

7. In an embossing machine including two longitudinally contacting rollsmounted on axes parallel to each other, a frame for mounting the firstroll with its axis in fixed position during operation of the machine,means for mounting the second roll in such frame so that its axis maymove toward the axis of the first roll, the improved means to drive suchtwo rolls in opposite directions in synchronism with each othercomprising a first gear fixedly connected to and rotatable with the neckof the first roll at a position outside the frame, a second gearpermanently meshing with the first gear, means on the frame for mountingthe second gear outside the frame on a fixed axis generally coaxial withthe second roll, the second roll having a neck extending freely throughthe second gear, the first and second gears having pitch diameters theratio of which at least closely approximates the ratio of the diametersof the respective rolls, an elongated housing member connected to theouter face of the second gear coaxially therewith and extending awayfrom said second roll to a point substantially removed from said secondgear and further removed from said second roll, an outboard bearingconnected to the frame of the ma chine rotatably supporting the outerend of the housing, a driving shaft lying within the housing andextending substantially from and connecting the outer end thereof to theaforementioned neck of the second roll, said driving shaft including aflexible coupling connected serially thereof, and means for rotatablydriving the connected system consisting of the two rolls, the first andsecond gears, the housing, and the driving shaft.

8. In an embossing machine including two longitudinally contacting rollsmounted on axes parallel to each other, means including two spaced framemembers for mounting the first roll with its axis in fixed positionduring operation of the machine, means for mounting the second roll insuch frame members so that its axis may move toward the axis of thefirst roll, the improved means to drive such two rolls in oppositedirections in synchronism with each other comprising a first, pinion,gear fixedly connected to and rotatable with the neck of the first rollat a position outside a first one of the side frame members, a second,ring, gear permanently meshing with the first gear, means on the outerside of the first side frame member for mounting the second gear on afixed axis generally coaxial with the second roll, the second rollhaving a neck extending freely through the second gear, the first andsecond gears having pitch diameters the ratio of which at least closelyapproximates the ratio of the diameters of the respective rolls, anelongated. housing member connected to the outer face of the second gearcoaxially therewith and extending away from said second roll to a pointsubstantially removed from said second gear and further removed fromsaid second roll, an outboard bearing connected to the frame of themachine rotatably supporting the outer end of the housing, a drivingconnection lying within the housing from the outer end thereof to theneck of the second roll at the first frame member, said drivingconnection comprising a first flexible coupling connected to the housingsubstantially at the outer end of the latter, a shaft connected at itsouter end to the inner end of the first coupling, a second flexiblecoupling connected to the inner end of the shaft, the inner end of thesecond coupling being fixedly connected to the aforesaid neck of thesecond roll, and means for rotatably driving the connected systemconsisting of the two rolls, the first and second gears, and the drivingmeans connecting th second gear to the second roll.

9. In the combination set out in claim 8, the flexible couplings beingof the backlash free gear type.

10. In an embossing machine including two rolls mounted on axes parallelto each other, means for mounting the first roll with its axis in fixedposition during operation of the machine, means for mounting the secondroll so that its axis may move toward the axis of the first roll, theimproved means to drive such two rolls in opposite directions insynchronism with each other comprising a first gear fixedly connected toand rotatable with the first roll, a second gear mounted on a fixed axisgenerally coaxial with the second roll and permanently meshing with thefirst gear, a first, hollow, shaft connected to and rotatable with thesecond gear, said hollow shaft lying generally coaxial with the secondroll and extending away from said second roll to a point substantiallyremoved from the second gear and further removed from said second roll,a second shaft lying within the hollow shaft and connected theretosubstantially at said point spaced from the second gear and to thesecond roll and rotatable with the hollow shaft, the train consisting ofthe hollow shaft and the second shaft rotating at the same speed as thesecond gear, said train incorporating serially thereof a flexibledriving connection, a prime mover, and means for drivingly connectingthe prime mover to the hollow shaft.

11. In an embossing machine including two longitudinally contactingrolls mounted on axes parallel to each other, means including two spacedframe members for mounting the first roll with its axis in fixedposition during operation of the machine, means for mounting the 1 theimproved means to drive such two rolls in oppostie directions insynchronism with each other, comprising a first, pinion, gear fixedlyconnected to and rotatable with the neck of the first roll at a positionoutside a first one of the side frame members, a second, ring, gearpermanently meshing with the first gear, means on the outer side of thefirst side frame member for mounting the second gear on a fixed axisgenerally coaxial with the second roll, the second roll having a neckextending freely through the second gear, the first and second gearshaving pitch diameters the ratio of which at least closely approximatesthe ratio of the diameters of the respective rolls, an elongated housingmember connected to the outer face of the second gear coaxiallytherewith and extending away from said second roll to a pointsubstantially removed from said second gear and further removed fromsaid second roll, an outboard bearing connected to the frame Of themachine rotatably supporting the outer end of the housing, a drivingconnection, lying within the housing, from the outer end thereof to theneck of the second roll at the first frame member, said drivingconnection comprising a first flexible coupling connected to the housingsubstantially at the outer end of the latter, a shaft connected at itsouter end to the inner end of the first coupling, a second flexiblecoupling connected to the inner end of the shaft, the inner end of thesecond coupling being fixedly connected to the aforesaid neck of thesecond roll, a rotary prime mover, and means for connecting the primemover to the housing whereby to rotate the latter and to effect drivingof the connected system of the two rolls, the first and second gears,and the driving means connecting the second gear to the second roll.

HERMAN EBERHARDT.

REFERENCES CITED The following references are of record in the file ofthis patent:

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